Compile a function. When n is an even number, call the function to calculate 1/2 + 1/4 +... + 1/n. When n is an odd number, call the function 1/1 + 1/3 +... + 1/n ., Even number

Compile a function. When n is an even number, call the function to calculate 1/2 + 1/4 +... + 1/n. When n is an odd number, call the function 1/1 + 1/3 +... + 1/n ., Even number

First, write a function whose n is an even number:

def peven (n):
     s = 0.0
     for i in range (2, n + 1,2):
         s + = 1.0 / i
     print 'value:', s

Write another function with n as an odd number:

def podd (n):
     s = 0.0
     for i in range (1, n + 1,2):
         s + = 1.0 / i

Write an input box:

N = int (input ('input number :'))

Then judge the Parity:

if n % 2 == 0:
    peven(n)
else:
    podd(n)

The above is the analysis step, and the complete code is attached.

1 #coding: utf-8
  2 def peven (n):
  3 s = 0.0
  4 for i in range (2, n + 1,2):
  5 s + = 1.0 / i
  6 print 'value:', s
  7
  8 
  9 def podd (n):
10 s = 0.0
11 for i in range (1, n + 1,2):
12 s + = 1.0 / i
13 print 'values:', s
14
15 n = int (input ('Enter a number:'))
16
17 if n% 2 == 0:
18 peven (n)
19 else:
20 podd (n)